| 1 | |
|---|---|
| 2 | #ifndef BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED |
| 3 | #define BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED |
| 4 | |
| 5 | // Copyright Aleksey Gurtovoy 2000-2004 |
| 6 | // |
| 7 | // Distributed under the Boost Software License, Version 1.0. |
| 8 | // (See accompanying file LICENSE_1_0.txt or copy at |
| 9 | // http://www.boost.org/LICENSE_1_0.txt) |
| 10 | // |
| 11 | // See http://www.boost.org/libs/mpl for documentation. |
| 12 | |
| 13 | // $Id$ |
| 14 | // $Date$ |
| 15 | // $Revision$ |
| 16 | |
| 17 | #include <boost/mpl/iterator_tags.hpp> |
| 18 | #include <boost/mpl/next_prior.hpp> |
| 19 | #include <boost/mpl/deref.hpp> |
| 20 | #include <boost/mpl/list/aux_/item.hpp> |
| 21 | #include <boost/mpl/aux_/na.hpp> |
| 22 | #include <boost/mpl/aux_/lambda_spec.hpp> |
| 23 | #include <boost/mpl/aux_/config/ctps.hpp> |
| 24 | |
| 25 | namespace boost { namespace mpl { |
| 26 | |
| 27 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
| 28 | |
| 29 | template< typename Node > |
| 30 | struct l_iter |
| 31 | { |
| 32 | typedef aux::l_iter_tag tag; |
| 33 | typedef forward_iterator_tag category; |
| 34 | }; |
| 35 | |
| 36 | template< typename Node > |
| 37 | struct deref< l_iter<Node> > |
| 38 | { |
| 39 | typedef typename Node::item type; |
| 40 | }; |
| 41 | |
| 42 | template< typename Node > |
| 43 | struct next< l_iter<Node> > |
| 44 | { |
| 45 | typedef l_iter< typename Node::next > type; |
| 46 | }; |
| 47 | |
| 48 | #else // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
| 49 | |
| 50 | template< typename Node > |
| 51 | struct l_iter |
| 52 | { |
| 53 | typedef aux::l_iter_tag tag; |
| 54 | typedef forward_iterator_tag category; |
| 55 | typedef typename Node::item type; |
| 56 | typedef l_iter< typename mpl::next<Node>::type > next; |
| 57 | }; |
| 58 | |
| 59 | #endif |
| 60 | |
| 61 | |
| 62 | template<> struct l_iter<l_end> |
| 63 | { |
| 64 | typedef aux::l_iter_tag tag; |
| 65 | typedef forward_iterator_tag category; |
| 66 | #if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) |
| 67 | typedef na type; |
| 68 | typedef l_iter next; |
| 69 | #endif |
| 70 | }; |
| 71 | |
| 72 | BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(1, l_iter) |
| 73 | |
| 74 | }} |
| 75 | |
| 76 | #endif // BOOST_MPL_LIST_AUX_ITERATOR_HPP_INCLUDED |
| 77 |